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##Dilution Streak (streaking for individual colonies) x2  After incubation, choose desired colonies (we typically attempt to maximize the diversity of colony morphologies) and dilution streak them onto individual plates. Dilution streaking involves a spreading out a chosen colony such that single colonies grow on a new plate (details can be easily found online).  After growth to visible colonies, repeat the dilution streaking to help ensure purity of the culture. Some organisms will only grow in tight association with others, and a mixed culture will prove difficult to classify (because there will be more than one 16S rDNA sequence amplified and sequenced) andpotentially  difficult to assemble. ##Liquid Culture  After the second dilution streaking, a liquid culture is needed both for long-term storage and for DNA extraction. Transfer a single colony from each dilution streak plate into 5 mls of culture media and grow for 1-3 days until cloudy. Once the liquid culture is ready, prepare a 10% final concentration glycerol stock for long-term storage at -80°C from 1-2 ml of the sample.